Colors in pdf files changed when I open those files in the iPad.

I usually use iPad and Goodreader for reading journal articles.
There is one big problem reading the papers using iPad because colors in pdf files looks abnormal.
When I use my labtop and desktop, I can see whole colors in the pdf files, so I can see what is exactly happening in the images in pdf files.
However, I cannot catch any details from those images in pdf files when I use my iPad.
For example, some colors in the pdf files disappeared and whole images in the pdf files looks too dark.
I searched for some informations to solve this problem using google but I cannot find exact method.
Many people said about this problem for a long time (maybe three years ago?) but it has not been solved yet.
Can anyone suggest me how to solve this problem?
If this issue cannot be solved, I think I do not have any reasons for using my iPad.

You've just uncovered something I don't really know.  I had naively thought the Central Database and Cache are one and the same (and that the [ Purge Cache ] button would clear saved settings), but now I'm not so sure. 
I tested by changing the parameters of a raw file, and I didn't see any files inside the Cache folder change their modification dates, which is not at all what I expected.
I don't really want to press the [ Purge Cache ] button to check it here, because I want to retain my own settings.  You could try it and see if it clears the white balance setting on a particular file.
-Noel

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